Installation and Service Manual

3
Conversion
1. Remove the access panel to the heater.
2. Disconnect the gas supply to the heater.
3. Remove the electrical connections from the gas valve. This
should not require the use of tools.
4. Remove the four (4) screws holding the manifold to the
burner box. This will allow for the removal of the manifold
and gas valve assembly.
5. Remove the orifices from the manifold assembly and place
them where they can be used if the heater should need to
be converted back to natural gas.
6. Insert the #56 propane orifices from the kit into the manifold
assembly. If you are converting an HD/HDS 30, 45, or
60 heater you will have extra orifices, which should be
discarded. Tighten the orifices using a wrench so that they
are gas tight.
7. Convert the combination gas valve by following the
instructions in the regulator kit.
8. Affix the Propane Rating Plate label on the heater, near the
serial plate on the same panel as the common replacement
parts label.
9. Place the manifold assembly back on the burner box using
the four (4) screws.
10. Replace the electrical connections to the gas valve.
11. Verify that the igniter and sensor are in the same location
and have not been damaged.
12. Connect the gas supply to the heater.
Check
1. Place pressure taps on both the inlet and outlet pressure
tap of the gas valve.
2. Connect a pressure-measuring device capable of reading
inches of water column on both the inlet and outlet pressure
tap.
3. Place the unit in operation. Verify the proper ignition
sequence. The inlet pressure should be 11" - 14" water
column. The manifold pressure should be 10” water column.
4. There are no adjustments that can be made to the burner
flame. Some yellow in the flame is acceptable as long as no
carbon (black soot) is being formed.
Make certain to verify the input rate as described in item #7
below.
5. Turn the heater off and replace the inlet and outlet pressure
tap plugs.
6. Place the heater back into service and leak test the inlet and
outlet pressure tap plugs as well as the connection between
the gas valve and the manifold pipe.
7. See the original rating plate for the unit heater’s rated input.
The input can be verified at any time simply by checking the
correct main burner orifice size and manifold pressure. This
information is presented on the conversion kit rating plate.
CAuTIoN
Shut-off the gas supplies and disconnect the electrical power
before servicing the heater.